Why Won't My Iris Bloom? - Knowledgebase Question

Chicago, IL
Avatar for schwinghamer
Question by schwinghamer
May 5, 2001
I have some Iris I planted thre yrears ago. They reveive partial to full fun in a semi-protected location. The rizomes are set in the soil, barely covered. I keep them weeded out and fed and I watch for any pests, especially those that will bore through the rizomes. The plans spreads and it did bloom the first year after I planted it but it refuses to bloom any more. What am I doing wrong?

Answer from NGA
May 5, 2001
Sometimes iris slow down due to low fertility or to overcrowding or to old age. You might try fertilizing them if you haven't done so already and dividing them if they are crowded. Dividing can be needed as soon as three years after planting if they were planted close together in the beginning. Discard the oldest portions of the rhizomes and replant only the healthy, younger more vigorous sections.

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